docs: fix the ocis init config path in the docs

[SwikritiT]

Part of: owncloud/ocis#7940

While testing the docs for the docker container following command responds

docker run --rm -it \
    --mount type=bind,source=$PWD/ocis/ocis-config,target=/etc/ocis \
    owncloud/ocis init

Do you want to configure Infinite Scale with certificate checking disabled?
 This is not recommended for public instances! [yes | no = default] 

=========================================
 generated OCIS Config
=========================================
 configpath : /etc/ocis/ocis.yaml
 user       : admin
 password   : <some-value>

The config path is /etc/ocis/ocis.yaml and not /etc/ocis/ocis-config/ocis.yaml . I don't know if this is an expected path or not but the command responds as such and the setup also works.

This PR fixes the configpath

[saw-jan]

👍